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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control for ACVC800603BXAB gas furnaces. This high-temperature limit opens the gas valve circuit if the heat exchanger or burner area exceeds its rated temperature, protecting the furnace from overheating and flame rollout. Because it is manual-reset, it must be physically reset after a trip — a deliberate design that flags a real fault for inspection.
The OEM 10123529 is calibrated to the exact trip temperature Goodman engineered for this furnace. Generic switches with the wrong setpoint can nuisance-trip or, worse, fail to protect the unit. For a safety-rated control, always use the OEM part.
Easy (1/5) — Shut off power and gas, disconnect the two spade terminals, remove the mounting screws, and install the new switch in the same orientation. A 10-minute repair.